Antidrift lock for radio control



July 14, 1936- R. B. MEYER ET'AL 2,047,219

Y ANTIDRIFT LOOK FOR RADIO CONTROL Filed Aug. 14, 1955 INVENTORS E. 5. Meyer BY Corrie F Rudolph ATTORNEY Patented July- 14, 1936 V an 17,2191 V ANTIDRIFTLOCK'FOBjRADIOTCONTROL V i l "Raymond B.1. Meyer and Carrie F; Rudolph,

Washington, D. C.

' fApplic-ation ugust 114, 1935, S'eria1No.36,16(i v This invention relates to anantid rift lock for a radio control andhas f'or an object to provide anlimprovedmearis -forholding the control shaft in a radio set against undesired rotation, thus preventing the tuning of the circuit from being disturbed.

It is the usual practice to adjust the various circuits of a radio transmitter or radio receiver by means of controls connected in some manner to variable capacitors or variable inductors.

These controls usually terminate in a crank handle or a knob on the end of ,a shaft extending through the front panel of the radio set. A crank is the most desirable form of control means where speed and ease of operation are desired. This form of control, however, includes a certain amount of unbalanced weight connected with the control shaft and thus, when the crank is brought to rest in any position other than vertical, vibration or jarring will cause the crank to move, thus destroying the tuning of the circuit I in question. This is especially true when the radio is on board an airplane or a vessel where the use of a crank or arm on the control shaft is most desirable. In order to overcome this difiiculty this invention provides a locking device on the control shaft to prevent such undesired drift or rotation.

The device consists essentially of a tapered,

threaded bushing encompassing the control shaft and affixed to the radio panel, the bushing having over it a large knurled nut. The bushing is slotted beyond the radio panel and is provided with a tapered thread so that as the nut is moved from one end to the other, the bushing is constricted to grip the shaft and prevent its rotation. Thus, a well distributed pressure and friction is provided on the shaft, holding it at any angle at which it may be set.

With the foregoing and other objects in view,

as will hereinafter become apparent, this invention comprises the construction, combination and arrangement of parts hereinafter disclosed, claimed and illustrated on the accompanying drawing, wherein,

Fig. 1 is a sectional view of the invention as applied to a control shaft of a radio set, and

Fig. 2 is a perspective partly sectional view of the invention disassociated from the radio set.

50 There is shown at III the antidrift lock of this invention, which is afiixed to the front panel ll of a radio set l5. The lock includes a bushing affixed in the same aperture in panel ll through which the radio control shaft I2 extends. To one 55 end of this control shaft I2 is affixed a crank l3 j "g,lam ;;...a..;;.a;ma March 3.18 as j l 1 amended ApriIBQ, 1928; s70 0.G.75 7) 1 I having a handle or knob. The end lliof the bushing is affixed tothe panel 'I l against rotation by -any suitable means such-as weldingmi brazing or by the pin I'l extending into the panel. The other end of this bushing is provided with a plu- 5 rality of longitudinal slots 18 and the external surface of the bushing throughout the slotted portion is provided with a tapered thread I9 about which is placed the nut 20, knurled as at 2|, for ease in manipulation. The end of the 10 threaded portion l9 may be provided with a retaining ring 22 to prevent accidental loss or removal of the nut 20.

In operation, the normal unconstricted diameter of the bushing is such that the shaft I2 may 15 be rotated freely therein and in this position the crank or arm 13 is manipulated by means of the knob Hi, to properly tune the radio l5. When the radio has been properly tuned, the nut 20 is tightened on the bushing l9 by rotating it about 20 the tapered thread l9 towards the enlarged end thereof, thereby causing the bushing to constrict and grip the radio shaft l2, which passes therethrough. The shaft 12 is thus locked against undesired rotation, being gripped with a well dis- 25 tributed friction or pressure thereabout. When desired to re-tune the radio it is only necessary to loosen the nut 20, permitting the shaft to be turned by means of a crank arm l3 and handle knob I4. 30

The invention herein described may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon. 35

What is claimed is:

1. An antidrift lock for the control shaft of a radio set wherein the control shaft has an off-- center weight for easy manipulation thereof, said antidrift lock comprising a constrictable 4O bushing encompassing the control shaft and affixed to the radio set panel.

2. An antidrift lock for the control shaft of a radio set wherein the control shaft has an offcenter weight for easy manipulation thereof, said antidrift lock comprising a constrictable bushing encompassing the control shaft and aflixed to the radio set panel, said constrictable bushing being longitudinally slotted and provided with a tapered thread therein, said means for constricting the bushing comprising a knurled nut adapted to be operated along the tapered thread.

' 3. An antidrift lock forthe control shaft of a radio set wherein the control shaft has an offcenter weight for easy manipulation thereof, said antidrift lock comprising a constrictable bushing encompassing the control shaft and affixed to the radio set panel, and means for constricting said bushing on the shaft to prevent rotation thereof.

4. An antidrift lock for the control shaft of a radio set wherein the control shaft has an offcenter-weighted crank arm for easy manipulation thereof, said antidrift lock comprising a constrictable bushing encompassing the control shaft and affixed to the radio set panel, and means for constricting said bushing on the shaft to prevent rotation thereof, said constrictable bushing being longitudinally slotted and provided with a tapered thread therein, said means for constricting the bushing comprising a knurled nut adapted to be operated along the tapered thread.

5. An antidrift lock for the control shaft of a radio set wherein the control shaft has an offcenter-weighted crank arm for easy manipulation thereof, said antidrift lock comprising a. constrictable bushing encompassing the control shaft and affixed to the radio set panel, and means for constricting said bushing on the shaft to prevent rotation thereof, said constrictable bushing being longitudinally slotted and provided with a tapered thread therein, said means for constricting the bushing comprising a knurled nut adapted to be operated along the tapered thread, and a retaining ring on the end of the tapered bushing preventing accidental displacement of the constricting nut.

6. An antidrift lock for the control shaft of a radio set which control shaft has a crank arm for easy manipulation thereof, said antidrift lock comprising constrictable bushing having a normal unconstricted diameter at least as large as the diameter of the radio control shaft, one end of said bushing being aflixed to the radio set, the 15 prising a nut adapted to be manipulated along 20 said tapered thread.

RAYMOND B. MEYER. CORRIE F. RUDOLPH. 

